Centrifugal pump.



A. M.'R0BES0N & A. DAVIDSON.

OENTRIFUGAL PUMP.

APPLIOATIQN FILED NOV. 16, 1900.

v Patented May 7, 1912.

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WITNESSES.

A. M. ROBESON & A. DAVIDSON.

- GEN'IRIPUGAL PUMP.

APPLICATION FILED NOV.1B, 1909. 1,025,425 Patented May 7, 1912.

4 BHEETS-BHEBT 2.

WITNESSES A. M. ROBBSON & A. DAVIDSON.

GENTRIFUGAL PUMP.

APPLICATION FILED NOV. 18, 1909.

Patented May 7, 1912.

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WITNESSES 04W y A. M. ROBESON & DAVIDSON.

CENTRIFUGAL PUMP.

APPLICATION FILED NOV. 13, 1909.

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Fig.14.

y 1 UNITED STATES PATENT oFFioE.

ANTHONY MA U RIGE BOBES ON AND ANDREW DAVIDSON, or JoHANNEsnune,

TBANSVAAL GENTRIFUGAL PUMP.

' PatentedMay7,1912.

To all whom it may concern: I

Be it known that we, ANTHONY MAURICE RoensoN and ANDREW DAVIDSON, both subjects of His Majesty the King of Great Britain and Ireland, and residents of J ohannesburg, Transvaal, the latter residing temporarily at Rochdale, Lancashire, England, have invented certain new and useful I nprovements in Centrifugal Pumps, of which the following is a specification.

The present invention has reference to centrifugal pumps, and more particularly to such pumps intended for moving liquids containing solid matter, especially when such matter is of a gritty nature. I

The object of the invention is to improve the construction and arrangement of centrifugal pumps in several particulars whereby they are better adapted to ban le mixtures of solid and liquid, are pro ted against wear thereby, and their repair d adjustment is facilitated.

To this end the invention consists in th combination with the pump proper of a novel suction. chamber: in the means for shielding the moving parts from lodgment of grit in the improved form and construction of the liners: and in the novel means facilitating the disassembling and renewal of the parts, all as hereafter described and specified in the claims.

The invention is illustrated panying drawings in which Figure 1 is a longitudinal section of a complete centrifugal pump constructed according to the invention. F1 2 is a sec-' tional view on theline 22 Fig. 1. Fig. 3 is a plan view of Fig. 1. Fig. 4 1s a sectional view and Fig. 5 an end vlew drawn to an enlarged scale, of the coupling employed between the pump and the motor. Figs. 6 and 7 are views of portions of Figs. 1 and 2 respectively, drawn to an enlarged scale. Fig. 8 is an elevation of a side liner. Figs. 9, 10 and 11 are views similar to Figs. 1, 2 and 3 respectively but illustrating a double special suction or pump intake and Figs. 12 and 13 are sectional front and side elevations respectively of a sim lar pump having a side suction. Fig. 14 is a longitudinal section of an impeller casing of a pump having a. silex; or similar lining, drawn to an enlarged scale. Fig. 15 is a section on the line 1414 Fig. 14.

Referring more particularly to Figs. 1 to,

in the accom- 7 a represents a suction chamber constructed in the form of a rectangular box and ex-.

tending all around the pump intake 8. Said suction chamber is surmounted by a feed hopper a into which the material to be pumped is fed by such means as a launder b.

t a convenient point in the suction chamber is fitted a cleaning door 1) and the chamber, particularly in the parts below the intake 8, is made roomy enough to permit heavy or bulky masses of rock or other material, which might injure the pump if passed into it, to settle and collect, whence they are removed from time to time through door 1). The suction chamber is as indicated formed with plane walls and is lined internally with renewable lining plates or slabs w of any desired material. It will be understood that a suction chamber as described is more accessible, insures greater safety to the impeller and is more readily -rfiitted when worn, than'the usual suctionpipe.

The impeller d which may be of any ordinary or convenient type is mounted upon the spindle f. Said spindle passes, on the suction chamber side, through a combined spindle bearing and cover m, which is bolted externally to the outer wall of the suction chamber and extends in the form of a sleeve m up to the impeller thereby shielding the spindle from the flowing material.

m represents the bearing proper to which water is supplied through a pipe m Such water passes away through the hollow interior of sleeve m and thence between the adjacent faces of the sleeve and the impeller; the purpose being to prevent access of grit to the spindle f.

m indicates the usual st-ufling box for the spindle. On the opposite side of the impeller the spindle is supported in a bearing p formed in cover p of the lateral door through which access is had to the impeller; said bearing being kept clean, similarly to bearing m by means of water injected through pipe 39 i Spindle f is connected to the pulley or motor shaft (7 by means of a novel coupling: consisting 0 an internally conical socket it formed or secured rigidly upon shaft 9: a

split cone 11 adapted upon compression, to engage spindle f and means such as the bolts j for drawing the cone into the socket. The cone z engages the spindle by means recast;

' Y .tueeeaewrseeeeeb aemdressmaking a screw kwhich is provided for the purpose, whereupon the split cone 2 expands slightly thus freeing itself from the, spindle j which may'then be withdrawn; By the reverse op- 'eration coupling is effected with equal fa-' e y 2 I is the' usual thrust bearing for taking-up the endihmst iofa single suction pump; r

The intazlreuazf mad'e' suhsfiantfafiii or lindricaf form, and-'isfitted with; a similarly shaped renewable liner 8" retainedby? set:

screws e01 other'serviceable" means: V

- ,Internalljfthe casinggjs shielded-by the finer m Linero, showi e arg 8T a'ndinthe upper'lialf of Fig: 6-,.may be -provided centrallywith' a; lip=j0 constituting. a:

continuation of the intake liner 8 and be ing suitably shaped at its free edge to deliver the fluid to the impeller. The side liners o, g are secured to the'ad'acent casmg parts by T headed bolts X Flg. 6 and by screw studs g which project through the outer casing into soft metal disks g cast or. worked into the hard metal of the liners, said studs being secured by external studs 3 Both these fastenings avoid grooving or interruption of the inner-surface of the liners and so materially minimize their .-liability to scouringywhile the last described fastening will hold until the liner is practically wornlthrough,

Lodgment of grit between the impeller and the side liners and consequent abrasion of ,those parts is minimized by passing water through pipes z and e to the central zone of the impeller and forming small vaneslnl externally of the impeller. Said 'vanesare such as, when the pump is at work, to cause the injected water to flowoutwardly and prevent reverse flow of the pumped liquid outsidethe impeller which is often found to occur at present.

The peripheral liner n is preferably a single annular piece as illustrated, having an integral outlet pipe 12 which joints with the outlet' pip'e e of the casing 6, It is retained in place by means of the oppositelg disposed set screws it which extend throug the casing, on opposite. sidesthereof, and make contact with lugs r formed on the: opposite sides of theliner. By means of said set screws the pipe e may be forced up to make joint with the casing.

The jointing between the side liners andthe peripheral liner is effected by. forming upon said side liners a number of lugs g separated by depressions g}. The edges of the lugs are worked up to fittaccurately .within the orifices of the peripheral "liners r botharetain; caIkiiigJn lace andprevent liner. n is effected by means of a door t .Which-is bolted to the fixed casing e at the vdischarge pipe end thereof.

Figs. 9 to 11 show the above described arrangements modified for application to a a a; They suction c amber an its appurtenances-being omitted, and one inlet passage p heing formed in the cover 1;. It is thought the. figures are sufficiently covered by: the foregoing description. A similar Figs. I2and13.

A. further method of lining is illustrated subsequently remaking any difficult or inaccessible joint.

What we claim is- 1. Ina centrifugal pump, a casing having a peripheral door opening, an impeller m said casing, removable linings around around said linings for more than one half of the circumference and the said door opening being large enough to permit the radial removal of the linings, and a door for said door opening.

' 2. In a centri ugal pump, a one part casing, an impeller in said casing, removable linings around said impeller, the said casing extending at its sides and periphery more the bodliy removal of said linings radially, and a closure for said open end.

3. In a centrifugal pump, a casing open end, the said casing being provided with an outlet in its top near the open end, an annular peripheral liner fitted within said casing having a tangential outlet registering with said casing outlet, a removable door for closing said open end of said casing,

casing.

; 4. In a centrifugal pump, a casing having an outlet pipe, an impeller in said casing,

an annular peripheral lining having a tangential outlet adapted to fit said outlet pipe, and a removable door in the periphery of double suction pum a having s iral intakes gin Figs. laia-nd 155. In this instance suitat one end and semi-circular at its other.

Y SSZIQWIEPWEIGG-GMRHM suitabIe-calkingmaterial; The

pump having one suction a is shown in said impeller, the said casing extending than-half way around said linings and havmg an.open end sufiiciently large to permit and means for clamping said liner in said i as great as the diameter of the lining.

5. In a centrifugal pump, a casing an outlet pipe, an annular peri heral lininghaving a tangential outlet fitting said casing outlet pipe, and tangential connections between sald lining and casin for. turning said lining to bring said lining outlet in contact with said casing outlet and to clamp the linin in place.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

I ANTHONY MAURICE ROBESON.

ANDREW DAVIDSON.

Witnesses as to Anthony Maurice Robeson:

Enwm N.- GUNBAULUS, W. KRUGER. Witnesses as to' Andrew Janna L. MAXIM, R. D. DAVIDSON.

Davidson 

